51. What are the links between Dhruva, Purnima and Cirus?
52. In LASER (say neon LASER) all the atoms emit the light waves of
53. Which one of the following is the source of renewable energy in stars?
54. In which region of electromagnetic spectrum does the Lyman series of hydrogen atom lie?
55. Enriched Uranium is
56. Nuclear fission is a process of . . . . . . . .
57. Which of the following technologies has been used by China for its 'artificial sun'?
58. 1 curie is equal to
59. Consider the following statements.
1. The chain reaction process is used in nuclear bombs to release a vast amount of energy, but in nuclear reactors, there is no chain reaction.
2. In a nuclear reactor, the reaction is controlled, while in nuclear bombs, the reaction is uncontrolled.
3. In a nuclear reactor, all operating reactors are 'critical', while there is no question of 'critically' in case of a nuclear bomb.
4. Nuclear reactors do not use moderators, while nuclear bombs use them.
Which of the above statements about operational principles of a nuclear reactor and a nuclear bomb is/are correct?
1. The chain reaction process is used in nuclear bombs to release a vast amount of energy, but in nuclear reactors, there is no chain reaction.
2. In a nuclear reactor, the reaction is controlled, while in nuclear bombs, the reaction is uncontrolled.
3. In a nuclear reactor, all operating reactors are 'critical', while there is no question of 'critically' in case of a nuclear bomb.
4. Nuclear reactors do not use moderators, while nuclear bombs use them.
Which of the above statements about operational principles of a nuclear reactor and a nuclear bomb is/are correct?
60. Consider the following sentences.
1. The phenomenon of emission of electrons from metals under the effect of light rays is called photoelectric effect.
2. The electron emitted by the photoelectron effect are called proton.
3. The phenomena like interference diffraction and polarisation were explained successfully on the basis of wave nature of radiation.
Which of the above sentence/sentences is/are correct?
1. The phenomenon of emission of electrons from metals under the effect of light rays is called photoelectric effect.
2. The electron emitted by the photoelectron effect are called proton.
3. The phenomena like interference diffraction and polarisation were explained successfully on the basis of wave nature of radiation.
Which of the above sentence/sentences is/are correct?
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